Tax revenue is an important source of income for the government and it provides the necessary funds to finance various government expenditure. The study aims to identify the factors that will influence taxpayers' willingness to pay tax. One hundred SMEs business owners from Klang Valley participated in the questionnaire survey. SmartPLS3.2.9 was used to analyse the responses gathered. The study found that only perceived government spending affects the SMEs business owners' willingness to pay tax. Hence, to improve tax revenue for the country, the government should be more cautious in making government expenditure. Taxpayers' money should be spent wisely in areas which will bring about both short-term and long-term benefits to the taxpayers.